Incommensurate antiferromagnetic fluctuations in the two-dimensional Hubbard model
arXiv:0903.3168 · doi:10.1103/PhysRevB.80.014436
Abstract
Commensurate and incommensurate antiferromagnetic fluctuations in the two-dimensional repulsive t-t'-Hubbard model are investigated using functional renormalization group equations. For a sufficient deviation from half filling we establish the existence of local incommensurate order below a pseudocritical temperature T_{pc}. Fluctuations not accounted for in the mean field approximation are important--they lower T_{pc} by a factor \approx2.5.
7 pages, 8 figures, some changes due to referees' comments, equivalent to published version